Ap physics at my highschool gave me a hard question

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chyle
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A baseball has a mass of about 0.14 kg, and it is pitched towards home plate at a speed of about 46 m/s. If the bat exerts an average force of 8900 N for 2.1 ms, what is the final speed of the ball in m/s?
 

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Do you know what is the impulse of a force? Impulse = change in momentum. Using that, this is definitely a very easy problem. Of course, we have to assume that the ball went back right the way it came.
 
Impuls and change of momentum

F *[tex]\Delta[/tex]t = m * [tex]\Delta[/tex]v

[tex]\Delta[/tex]v is the change in velocity that you have, not the velocity by itself, but you probably know that :)